Research On Diffusion Resistance Of WC-Ni₃Al According To Cutting Of0Cr18Ni9Stainless Steel

0Cr18Ni9is a typical material which is difficult to be processed because of smallthermal conductivity, high chemical activity, easy to work hardening and so on. It is animportant and new way to use less Co or no Co binder WC cemented carbide material incutting of0Cr18Ni9which owns high heat resistance, high wear resistance, high strength andtoughness and thermal chemical stability. Ni3Al has high oxidation resistance, high thermalconductivity, high hardness and strength, strong resistance to high temperature softening andexcellent corrosion resistance. It has great potential to process0Cr18Ni9using WC-Ni3Alcemented carbide because of these features. However, in the study of WC-Ni3Al tool, Thewear mechanism and wear resistance properties are not be researched in cutting0Cr18Ni9austenitic stainless steels.This thesis mainly investigated on cutting performance and optimizing cuttingparameters of WC-Ni3Al when cutting0Cr18Ni9austenitic stainless steel. It includes thestudying of diffusion about WC-Ni3Al cemented carbide and0Cr18Ni9, analyzing of wearmechanism by experiment of cutting0Cr18Ni9austenitic stainless steel, confirmation ofoptimized cutting parameters and so on.Carbide tools of WC-10wt.%Ni3Al and WC-8wt.%Co were chosen for elementdiffusion experiment with0Cr18Ni9. The result shows that binder element Ni ofWC-10wt.%Ni3Al penetrated more difficultly into the0Cr18Ni9than element Co ofWC-8wt.%Co；Diffusion of non-carbide forming element Co distorts the crystal structure ofaustenitic stainless which reduces diffusion activation energy of carbon atom and increase thediffusion coefficient of carbon atom. As a result，element W and C of WC-8wt.%Co diffusedseriously. While diffusion coefficient of element W and C are smaller relatively because Ni ofWC-10wt.%Ni3Al diffuses less. WC-10wt.%Ni3Al has higher diffusion resistance thanWC-8wt.%Co. The hardness of WC-10wt.%Ni3Al is much higher than WC-8wt.%Co and thehardness loss rate of WC-10wt.%Ni3Al is smaller than WC-8wt.%Co near diffusion interface.The test is mainly cutting0Cr18Ni9austenitic stainless steel. Wear form andmechanism and durability of WC-Ni3Al tool is investigated. By analyzing the influence ofcutting parameters on the WC-Ni3Al tool wear，it clarified WC-Ni3Al carbide tool is suitable for low cutting speed and large cutting depth.This paper is studying the cutting force and cutting parameters on the influence of thecutting force by using orthogonal experiment method when cutting0Cr18Ni9stainless steel.Result shows that main cutting force on average of WC-6wt.%Ni3Al is smaller thanWC-8wt.%Co. Feed force almost has no difference between the two tools. WC-6wt.%Ni3Altool can reduce the cutting force of austenitic stainless steel effectively. The influence factorson main cutting force and the main effect is cutting depth ap>feed rate f>cutting speed v.Main cutting force increases linearly with the increasing of cutting depth and it also increaseswith the increasing of feed rate. When the cutting speed increases，the main cutting forcereduced.